A developer created these three Rollup Summary fields in the custom object, Project_ct, The developer is asked to create a new field that shows the ratio between rejected and approved timesheets for…

A Record-triggered Flow would add more complexity and maintenance compared to a declarative formula field, especially since the source data (rollup summaries) is already available.

A formula field can directly reference the existing Roll-up Summary fields that count approved and rejected timesheets on the Project_c object. This provides a real-time, automatically updated ratio with minimal maintenance overhead, as formulas recalculate automatically.

An Apex Trigger would be an overkill and higher maintenance for a simple calculation that can be done declaratively with a formula field based on existing data.

Process Builder, like Flow, could potentially update a field, but it's less direct and efficient for a simple ratio calculation from existing fields than a formula field and would involve more steps and maintenance.